On 05/05/17 20:16, Mark Trickett via luv-main wrote:

I was very familiar with the old IBM keyboards, the ones with a wedge connector and that could have a cable with an AT or PS/2 connector, but I have yet to find an adaptor from AT/PS/2 to USB that I can rely on. I have seen a USB mouse with adaptor to PS/2, but not for a keyboard, yet.

They definitely exist; I have both USB keyboard to PS/2 connector and PS/2 keyboard to USB adapters, and have successfully used a AT to PS/2 keyboard adapter stacked with one of the latter.

Having a second keyboard on a laptop would be "interesting"

My Samsung phone supports USB OTG, so in the past I have plugged in a small hub and a mouse and keyboard to use with my phone! The mouse pointer appears as soon as you plug in a mouse. Cheers, Andrew